Dell inspiron 13 7386 BLACK SCREEN

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  • lashakaraulashvili
    Member
    • Dec 2020
    • 13
    • georgia

    #1

    Dell inspiron 13 7386 BLACK SCREEN

    Hello, this issue caused by isl95859c ic, replaced ic but i have black screen, VCC and VIN was shorted on that ic. I have voltage on vcc and vin after replace but missing VR_EN signal, there is no short for cpu. What should i check now? Can it be bad isl95859c chip again?
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14030
    • Canada

    #2
    Re: Dell inspiron 13 7386 BLACK SCREEN

    VR_EN is enabled only after POWER GOOD signal is OK to indicate that all power rails are stable.

    See attached.

    Check the POWER GOOD voltage for the linked parts.

    Post your values.

    The schematic shows that there is a single gate open drain buffer for VR_EN but unable to find this part in the schematic in my database. Guessing that the engineers did a cost reduction and used the diodes and pull-up resistors to emulate the same function.
    Attached Files

    Comment

    • lashakaraulashvili
      Member
      • Dec 2020
      • 13
      • georgia

      #3
      Re: Dell inspiron 13 7386 BLACK SCREEN

      Checked with boardview
      Attached Files

      Comment

      • lashakaraulashvili
        Member
        • Dec 2020
        • 13
        • georgia

        #4
        Re: Dell inspiron 13 7386 BLACK SCREEN

        VR_EN has 3.36, VR_RDY missing

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 14030
          • Canada

          #5
          Re: Dell inspiron 13 7386 BLACK SCREEN

          What is the voltage of VR_RDY ?

          Comment

          • lashakaraulashvili
            Member
            • Dec 2020
            • 13
            • georgia

            #6
            Re: Dell inspiron 13 7386 BLACK SCREEN

            Originally posted by mon2
            What is the voltage of VR_RDY ?
            0v

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14030
              • Canada

              #7
              Re: Dell inspiron 13 7386 BLACK SCREEN

              Confirm the voltage on both pins of PR4609.
              Attached Files

              Comment

              • lashakaraulashvili
                Member
                • Dec 2020
                • 13
                • georgia

                #8
                Re: Dell inspiron 13 7386 BLACK SCREEN

                Originally posted by mon2
                Confirm the voltage on both pins of PR4609.
                0v both

                Comment

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